You buy a machine for $$50,000$ that will increase your gross income each year by $$15,000$ over what it is now. $($So you make, say, $$100$K$/$yr$,$ now you'll make $$115$K$/$yr$).$ Tax rate is $21\%,$ machine will last $5$y $($straight$-$line depreciation$),$ your discount rate is $10\%.$ What's the net after$-$tax benefit of the machine...how much extra cash are you taking in each year, including revenue and depreciation?

$$5,000$

$$11,850$

$$15,000$

$$13,950$